Concrete ore-bunker plant



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pmll 2, E929. J. SOCK CONCRETE ORE BUNKER PLANT Filed Feb. 5,1927

l l 1 l Patented Apr. 2,

CONCRETE ORE-BUNKER FLANT.

Application filed February 3, 1927, Serial No. 165,735, and in Germany March 8, 1926.

The ore bunkers made of concrete hitherto known have in most cases pyramidal discharge bottoms. t has been found that with such bottoms, when emptying the bunkers, numerous irregularities occur in the discharge, as the vore does not flow down uniformly to the discharge opening of the bunker, but the ore jams in. the form of arches over the discharge aperture.

The cause of such arch formations is to be found principally in the comparatively steep angle of inclination of the pyramidal surfaces required and in the great amount of friction occurring between the ore and the concrete. Furthermore, however, the corners formed by the pyramidal surfaces of the discharge bottom exert a retarding action upon the outflow of the ore, since the ore settles in the said corners very readily. This last disadvantage can be obviated by employing a conical discharge bottom, but this is not done, on account of it being ditlicult and therefore expensive to mak The difficulties enumerated are obvia-ted according to the present inventionby constructing the discharge bottom only in part as a conical concrete structure, while the remainder is formed of a conical metal insertion, preferably of sheet iron. Since the friction between the ore and the metal insertion is considerably less than that between ore and concrete, an angle of inclination of about 300 is sufficient in the case of a metal insertion to ensure complete discharge of the ore and to guard against the dangerous hanging or s affolding7 thereof.

rlhe invention is illustrated by way of example in the accompanying drawings wherein: y

Fig. l shows a longitudinal section through a concrete ore bunker plant according to the invention,

Fig." 2l a cross section through the plant shown in Fig. 1, and

Fig. 3 a horizontal section through the saine.

The concrete ore bunker plant according to the invention consists of bunker bins ct, every four of which are preferably united to form a bunker group or reservoir. rlhe individual bins are formed by longitudinal and transverse girders t and c, while the groups are enclosed by internal and external walls Z and e. Now the essential thing is that the bunker bins, which are rectangular in cross section'in the upper part, become conical concrete structures f in the lower part, the latter having an angle of inclination of about 45o. As will be seen from the di'awing, however, it is not the entire discharge bottom that consists of this concrete structure, but a conical metal insertion g, preferably of sheet iron, is provided in addition. The inclination of this sheet metal insertion is not so steep as that of the concrete structure, as the friction between ore and sheet iron is not so great as that between ore and concrete. The diameter of the sheet metal insertion is made sufficiently great to obviate in a. reliable manner the risk of the ore hanging in arched formations over the concrete body, and the ore located on the outer walls of the bunker bin, in consequence of the steepness of the concrete cone, is supplied to the discharge z, withoutleaving any residue.

For securing the sheet metal insertion g to the concrete structure f and for taking up the ring stresses produced by the weight of the ore, both in the concrete structure and in the sheet metal insertion, a horizontal carrying ring z' is arranged on each bunker bin, the outer periphery of the said carrying ring forming an octagon, as shown in Fig. 3.

7s, 7c denote the closures for the discharge apertures it, it; and Z denotes a vehicle, with buckets m.

By the present invention not only is the reliability of the working of the bunker plant enhanced, but a reduction in the cost of construction is also produced, as the erection of moulds for cncasing the conical concrete bottoms is saved, and the fastening of the closure 7c to the sheet metal insertions g can be effected in the workshop, that is to say, independently of the concrete construction.

Vhat I claim is l. Concrete ore bunker plant, consisting in combination of bunker bins rectangular in cross section, formed by longitudinal and transverse girders and combined by side and middle walls to forni bunker groups, each individual bunker bin having a conicalY discharge bottom in the edge portion of concrete, in the middle portion of metal, Athe edge portion having a steeper angle of inclination than the middle portion for insuring an undisturbed discharge of the ore from the bins.

2. Concrete ore bunker plant consisting in the combination of bunker bins angular in cross section formed by longitudinal and transverse girders and united by lateral and intermediate Walls to forni groups of bunko ers, each individual bunker bin having a conical discharge bottoni with a steep angle of inclination of about 450, of a concrete structure, a conical sheet metal insertion at tached to the firsbmentioned discharge bottoni with a less steep angle of inclination of about 300, a carrying` ring for holding the sheet metal insertion and for taking up the stresses arising -in the concrete structure and 10 in the sheet metal insertion, a closure for a discharge aperture in the sheet metal insertion, the closure beingpreferably fitted to said sheet metal insertion before the sheet nieta-1 insertion is secured in position. 10

In testimony whereof I have signed my name to this speciication.

JOSEF BOOK. 

